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The only way is to look it up. The isotopic ratio can be determined on a mass spectrometer. Most periodic tables will have the Atomic Mass otherwise Google the element the wikipedia article will have the average mass of the element listed there. A few elements like Lead do have differing isotopic ratios depending where it was mined.

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15y ago
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12y ago

multiply the mass of each isotope by the percent of the isotope. Then add all of these numbers together to find the average atomic mass.

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Q: Calculate the atomic mass of an element containing a mixture of isotopes?
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What is the average mass of the mixture of an elements isotopes?

All of the isotopes in an element's atomic masses divided by the amount of isotopes there are is the weighted-average mass of the mixture of an elements isotopes.


The mass of the mixture of the isotopes for an element?

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